Cable-brake for drag-line excavators.



w. FERRIS. CABLE BRAKE FOR DRAG LINE EXCAVATORS.

Patented Aug. 10, 1915.

APPLICATION FILED JUNE 7. 1912.

III

WALTER FEBRIS, OF SOUTH MILVTAUKEE, WISCONSIN, ASSIGNOR TO BUCYRUSCOMPANY, OF SOUTH MILWAUKEE, WISCONSIN, A CORPORATION OF WIS- CONSIN.

nseam.

CABLE-BRAKE FOR DRAG-LINE EXCAVATORS.

Application filed June 7, 1912. ScrialNo. 702,194.

To all whom it may concern Be it known that I, l/VAL'rnR FnRnIs, acitizen of the United States, residing at South Milwaukee, in the countyof Milwaukee and State of Wisconsin, have invented a certain new anduseful Improvement in "Cable- Brakes for Drag-Line Excavators, of whichthe following is a specification.

My invention relates to improvements in cable brakes for drag lineexcavators and the like and is illustrated diagrammatically in theaccompanying drawing, wherein- Figure 1 a detail plan view of the dumpinmechanism showing the preferred form; Fig. 2 a section along the line 55of Fig. 1;

Fig. 8 a section along the line 6-6 of Fig. 1.

Iiike parts are indicated by like letters throughout the severalfigures.

A. is an excavator boom or other foundation base for my cable brake.

The brake shoe B isin opposition to the cable A on the sheave A The bellcrank lever B which is pivoted on the boom A is connected by means ofthe link B with the outer end of the shoe'B. The bell crank lever Bwhich is pivoted on the boom A is connected at one end by means of thelink 13* with the bell crank lever B and at the other end is pivoted tothe finger B projecting rearwardly from the shoe B. The actuating link Cis controlled from the operating platform not shown to operate the bellcrank lever B and force the shoe against the cable to stop the rotationof the sheave and the passage of the cable thereabout. The link l3projects forwardly from the bell crank lever B and is connected to thespring C attached to the end of the boom A to normally hold the brakemembers out of the operative position.

The brake drum C is attached to the dumping sheave A the brake band C inopposition to the drum 0 is rigidly attached at one end to the boom Aand is pivoted at the other end to the bell crank lever G which is actuated by the controlling link C which terminates in the equalizingplate C The spring C attached at one end to the yoke C which in turn ispivoted to the bottom A and the other end to the link C pivoted to thebell crank lever C is adapted to hold the brake band normally in theinoperative position. The connecting link C terminates in the. adjustingequalizing yoke C to which is attached the controlling rod C leading tothe operating platform not shown.

It will be evident that while I have shown in my drawings an operativedevice, still many changes may be made in the size, shape andarrangement of parts without departing materially from the spirit of myinvention, and I wish therefore that my drawings may be regarded as in asense diagrammatic.

Patented Aug. 1c, 1915.

In the preferred form of my device the arresting of the movement ofthehoisting rope is done by means of the single brake shoe which is forcedinto contact with the dumping rope as it passes over the dumping sheaveand jams the rope against it. There is thus a braking effect both on thesheave itself and on the rope. this effect being exerted by the singlebrake shoe, which by its direct contact and pressure against the ropearrests its travel, and which by forcing the rope against the sheave,also tends to arrest the travel of the sheave.

In my device there is added to the braking effect of this single cableengaging brake shoe, the braking effect of the brake band which gripsthe brake drum attached tothe sheave and in, order that these pressuresmay be equalized in the modified form, I use an equalizing plate wherebywhen the operator draws in on the braking connection, each of the brakesresponds equally. In all cases, however, each separate brake is providedwith the separate retracting spring which tends to hold the brake out ofoperative relation with the sheave.

I claim:

The combination with a hoisting cable and a sheave about which ittravels, of a brake drum rigidly mounted on the sheave, a band brake inengagement with said drum, a brake block in opposition to the peripheryof the sheave and the cable traveling thereabout, and means forsimultaneously oper ating said brake block and brake band to cause themto grip respectively the cable and the drum, and equalizing meansinterposed between them.

WALTER FERRIS.

Witnesses:

HARRY B. HAYDEN, GnR'rnUon SEncoMB.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

. Washington, D. G.

